Comparative analysis of coal and coal-shale intrinsic factors affecting spontaneous combustion

• 来源期刊: 国际煤炭科学技术学报（英文）
• 关键词: Coal-shales Spontaneous combustion Liability index Statistical analysis and correlation coefficient
• 年，卷（期）: 2018,（3）
• 页码范围: 282-294
• 页数: 13页
• 语种: 英文

摘要

Coal and coal-shales tend to undergo spontaneous combustion under favourable atmospheric conditions.Spontaneous combustion liability index and intrinsic properties of coals and coal-shales varies between (above and below) coal seams.The spontaneous combustion liability index (obtained from the Wits-Ehac Index) and intrinsic properties (obtained from proximate,ultimate,and petrographic analysis) of fourteen samples representative of in situ coal (bituminous) and fourteen coal-shales obtained in Witbank coalfield,South Africa were experimentally studied.Comparative analysis of the relationships between the spontaneous combustion liability index and intrinsic properties of coals and coalshales were established to evaluate their effects on self-heating potential.The intrinsic properties show linear relationship with spontaneous combustion liability and therefore,identifies the factors affecting spontaneous combustion of these materials.The influence of coal-shales intrinsic properties towards spontaneous combustion liability shows higher correlation coefficients than the coals.Both coals and coal-shales show inertinite maceral as major constituents than the vitrinite and liptinite macerals,hence the reactivity of inertinite macerals may show greater influence on spontaneous combustion liability.A definite positive or negative trends exists between the intrinsic properties and spontaneous combustion liability index.This research is part of a larger project which is considering the influence of intrinsic properties of coals and coal-shales on spontaneous combustion liability.